看到物理作业算这种脑子有病的题就抑郁,题曰:沙粒近球形,半径为A,密度为B,求表面积跟一边长为1m的立方体相同的沙子有多重 [han] 怎么感觉比一边蓄水一边放水的题还欠抽…… ​​​ 赞[0] 转发[0] 评论[3] 收藏 置顶 删除 
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